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Comments on Why does this code that uses a pointer-to-pointer-to-int segfault?

Post

Why does this code that uses a pointer-to-pointer-to-int segfault?

+1
−3

Hello folks, can someone resolve this seg fault with me please, i can't find the error where it occur. Thank you.

#include <stdlib.h>
 #include <stdio.h>
 int ft_ultimate_range(int **range, int min, int max)
 {
    int lentgh;
    int i;
    int mi;
    
    mi = min;
    lentgh = max - min;
    if (min >= max)
    {
        // *range = NULL;
        return (0);
    }
    *range = malloc(sizeof(int) * lentgh);
    if(!range)
    {
        return 0;
    }
    i = 0;
    while (min < max)
    {
        range[0][i] = mi;
        i++;
        mi++;
    }
    return (i);
}

int main()
 {
    int i = 0;
    int min = 5;
    int max = 19;
    int **range = 0;
    int ptr = ft_ultimate_range(range, min, max);`

    while(i < max - min)
    {
        printf("%d\n", ptr);
        i++;
    }
    return (0);
}
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3 comment threads

Infinite loop (3 comments)
when i compile it i got no error, but when i run it using ./a.out i got : "segmentation fault ./a.ou... (1 comment)
What does the debugger tell you? (1 comment)
Infinite loop
hkotsubo‭ wrote over 3 years ago · edited over 3 years ago

while (min < max) - this is an infinite loop, because both min and max never change their values anywhere in the loop. Thus, i ends up accessing some position out of the array's bounds, which usually causes a segfault - I didn't test the code to see if there are more problems, but at a first look I could spot this one

M3dc0d‭ wrote over 3 years ago

thank u, i i have solve the problem, yes it's an infinite loop, i did declare a variable mi and i did'nt use it in the loop, i used the min variable. Thank u

elgonzo‭ wrote over 3 years ago · edited over 3 years ago

There is also another logical problem with your program (unrelated to the segfault, though). Hint: Compare what you believe the code in the while(i < max - min) { ... } loop in your main function does with what it actually does in reality...